The SharePoint Enterprise Search Migration Tool (SMT), created by Microsoft, is a great little tool for moving/migrating search settings from one SharePoint Search Service Application to another, and even from a SharePoint 2007 SSP to a SharePoint 2010 SSA or FAST for SharePoint. The tool is available for download from the MSDN Archive - both as a binary and its source code. It is a console application that creates an XML when exporting the settings and uses the same XML when importing the settings, and it works great in a scripting environment.